JPH01193480A - Solenoid valve - Google Patents

Abstract

PURPOSE:To prevent effectively the occurrence of uncomfortable sounds by specifying the relative relationship between the outer diameter of a projection provided on the central portion of the lower surface of a retainer and the inner diameter of a main value hole. CONSTITUTION:The relative relationship between the outer diameter d of a projection 15 provided on the central portion of the lower surface of a retainer 6 and the inner diameter D of a main valve hole 3 is assumed as follows; (D-d)/DX100<=10. Thus, a fluid resistance portion can be also formed between the peripheral edge of the projection 15 and the inner peripheral surface of a main valve seat 4, so that the fluid resistance in stopping water can be increased and a diaphragm 5 is slowly lowered to softly abut against the main valve seat 4 and stop water. Thus, the occurrence of water hammer in stopping water can be prevented as few as possible to prevent the diaphragm 5 from vibration, so that the occurrence of uncomfortable sounds can be surely prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a solenoid valve that can be effectively used as a solenoid valve for controlling fluid, such as a water stop valve or a hot/cold mixer faucet.

(b) Prior Art FIG. 5 is a cross-sectional view of a conventional biloft type solenoid valve described in Japanese Patent Publication No. 49-4423.

A main valve hole 3 is formed in the valve box C between the inlet 1 and the outlet 2, and on the main valve seat 4 provided at the upper opening periphery of the main valve hole 3,
A diaphragm 5 with a retainer 6 for opening and closing the main valve hole 3 is disposed so as to be able to come into contact with or come into contact with and separate from the main valve hole 3.

A vertically long pilot valve hole 7 is formed in the center of the retainer 6, and a bleed hole 9 with a smaller diameter than the pilot valve hole 7 is formed between the diaphragm back chamber 8 provided at the back of the diaphragm 5 and the inlet 1. has been done. Pilot valve hole 7
On the top is a plunger 11 driven by a solenoid 10.
The pilot valve hole 7 is opened and closed by a valve body 12 attached to the lower end of the plunger 11.

In such a configuration, the solenoid 10 is de-energized,
The plunger 11 is pushed down by the coil spring 13,
When the valve body 12 comes into contact with the valve seat of the viroft valve hole 7 and closes the pilot valve hole 7, fluid flows into the diaphragm back chamber 8 through the path of the inlet 1 - the bleed hole 9 - the diaphragm back chamber 8, The inflowing fluid pressure causes the diaphragm 5 to close to the main valve seat 4.
, and the main valve hole 3 is closed.

In addition, in the closed state shown in the figure, the solenoid 10 is energized, and the plunger 11 moves against the coil spring 13 to move the iron core 1.
4, the valve body 12 separates from the valve seat of the pilot valve hole 7, and the pilot valve hole 7 opens. Then, the fluid in the diaphragm 5 passes through the pilot valve hole 7 and flows out to the outlet 2 (Ill).

At this time, since the diameter of the pilot valve hole 7 is larger than the diameter of the bleed hole 9, the amount of outflow is greater than the amount of inflow into the diaphragm back chamber 8, and the pressure in the diaphragm back chamber 8 is reduced. As a result, the diaphragm 5 is pushed up by the pressure of the fluid flowing in from the inlet 1, and the diaphragm 5 is separated from the main valve seat 4 to open the main valve hole 3.

Moreover, as shown in FIG. 5, on the lower surface of the retainer 6,
A protrusion 15 for attaching the diaphragm 5 is provided.

(c) Problems to be Solved by the Invention However, in such a conventional solenoid valve, as shown in FIG. This can only be done by lowering and touching the top.

Therefore, when the water is stopped, sufficient resistance cannot be applied to the fluid, and as shown in Figure 7, even if the secondary pressure of the water outlet side flow path can be maintained constant, the primary side pressure of the water supply side flow path was changing rapidly, causing a water hammer phenomenon. Also,
Such water hammer causes the diaphragm of the solenoid valve to vibrate, producing an impact sound, that is, an unpleasant sound when water is stopped.

The present invention solves the above-mentioned problems and provides a solenoid valve that can prevent vibrations to the solenoid valve as much as possible, perform a valve closing operation quietly, and effectively prevent unpleasant noises. With the goal.

(d) Means for solving the problem The present invention forms a main valve hole between an inlet and an outlet provided in a valve box, and a main valve seat provided on one side periphery of the main valve hole. A pilot valve hole is formed in the center of the retainer, which supports the diaphragm and contacts the diaphragm that opens and closes the hole so as to be able to freely come and go. At the same time, the diaphragm back chamber and the inlet side are communicated through a bleed hole with a diameter smaller than the pilot valve hole, and a plunger driven by a solenoid is installed above the pilot valve hole, and In a solenoid valve configured so that the pilot valve hole is opened and closed by the valve body, the gap obtained by subtracting the outside diameter of the protrusion provided at the center of the lower surface of the retainer from the inside diameter of the main valve hole is relative to the inside diameter of the main valve hole. This invention relates to a solenoid valve characterized in that the ratio is 10% or less.

(e) Actions and Effects With the configuration described above, the present invention has the following actions and effects.

That is, since the ratio of the gap obtained by subtracting the inner diameter of the main valve hole from the outer diameter of the protrusion provided at the center of the lower surface of the retainer to the inner diameter of the main valve hole is 10% or less, the periphery of the protrusion and the inner surface of the main valve seat are A fluid resistance section can also be formed between the main valve seat and the diaphragm to increase the fluid resistance when the water is stopped, allowing the diaphragm to slowly descend and come into soft contact with the main valve seat, thereby shutting off the water.

Therefore, it is possible to prevent the occurrence of water hammer when water is stopped as much as possible, to prevent the occurrence of vibrations, to perform the water stop operation quietly, and to reliably prevent the generation of unpleasant noises.

(f) Examples The present invention will now be explained in detail based on examples shown in the accompanying drawings.

As shown in FIG. 1, the solenoid valve A according to this embodiment is substantially the same as the conventional solenoid valve described above, except for the relative relationship between the outer diameter d of the protrusion 15 and the inner diameter of the main valve hole 3. Components having similar functions are indicated by the same reference numerals in the drawings, and the description of such components has already been explained in the description of the prior art, so they will not be described here. This will be omitted and the above relative relationship will be mainly explained.

That is, as shown in FIGS. 1 and 2, the outer diameter d of the protrusion 15 provided at the center of the lower surface of the retainer 6 is only slightly smaller than the inner diameter of the main valve hole 3. for,(
D-d)/D X100 = 8.

With this configuration, it is possible to form an upper fluid restricting portion a between the lower surface 5a of the diaphragm 5 and the top of the main valve seat 4 having a semicircular cross section, and also to reduce the taper between the inner peripheral surface of the main valve seat 4 and the protrusion 15. A lower fluid restriction portion can also be formed between the surface 15a and the surface 15a.

Next, to explain the water stop operation in the electromagnetic valve having the above configuration, when water is stopped, when the diaphragm 5 is integrated with the retainer 6 and approaches the main valve seat 4, from the inlet 1 to the main valve hole 3. The fluid flowing into the
This will result in large fluid resistance. and,
In response to this fluid resistance, the diaphragm 5 slowly approaches the main valve seat 4 and comes into soft contact with the main valve seat 4 to complete water shutoff.

Therefore, the occurrence of water hammer when water is stopped due to sudden contact of the diaphragm 5 with the main valve seat 4 can be prevented as much as possible.

That is, as shown in FIG. 3, the attenuation curve of the return wave pressure P1 on the water supply side is relaxed to maintain the same return wave pressure P1 at all times.
The water discharge side pressure P2 can be maintained higher than the water discharge side pressure P2, and the generation of vibration to the diaphragm 5 that occurs when the water discharge side pressure P2 is higher than the water supply side return wave pressure P1 or in an equivalent case can be effectively prevented. The water stop operation can be performed quietly, and unpleasant noises can be reliably prevented from occurring.

In addition, FIG. 4 shows the outer diameter of the projection 15 and the main valve hole 3.
The pressure fluctuation range ΔP (the pressure difference between the water discharge side return pressure P1 and the water discharge side pressure P2 in FIG. 3) is shown when (D-d)/D, which is the relative relationship of the inner diameter d of the pressure, is changed.

As is clear from the figure, (D-a)/D xloo
From =4 to 8, the pressure fluctuation width ΔP shows the minimum value,
After that, the pressure fluctuation width ΔP gradually increases until (D-d)/D X100 = 10, and then (D-d)/D X1
When 00>lO, the pressure fluctuation range ΔP increases rapidly.

From this, it is preferable to set (D-d)/D x100≦10, and the optimal range is CD-d)/D x100≦4
~10.

As explained above, this embodiment has the following effects.

That is, since the ratio of the gap obtained by subtracting the outer diameter d of the protrusion 15 provided at the center of the lower surface of the retainer 6 from the inner diameter of the main valve hole 3 to the inner diameter of the main valve hole 3 is 10% or less, the protrusion 150
A fluid resistance part can also be formed between the periphery and the inner peripheral surface of the main valve seat 4, increasing the fluid resistance when water is cut off, allowing the diaphragm 5 to slowly descend, causing a soft pressure against the main valve seat 4. It can be brought into contact with water to stop water.

Therefore, it is possible to prevent the occurrence of water hammer as much as possible when the water is cut off, to prevent vibration of the diaphragm, to perform the water cutoff operation of the solenoid valve quietly, and to reliably prevent the generation of unpleasant noises.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional front view showing the overall configuration of the solenoid valve according to the present invention, Fig. 2 is an enlarged explanatory view of the main parts, and Fig. 3 is a change over time in return wave pressure on the water supply side and water discharge side pressure in the solenoid valve. A diagram showing the state, Fig. 4 is a diagram showing the relationship between the pressure difference between the return wave pressure on the water supply side and the water discharge side pressure, and (D-d)/D x 100, and Fig. 5 shows the configuration of a conventional solenoid valve. FIG. 6 is an enlarged explanatory view of the parts related to the present invention in the conventional solenoid valve, and FIG. 7 shows changes over time in return wave pressure on the water supply side and water discharge side pressure in the solenoid valve. It is a diagram. In the diagram, A: Solenoid valve l two ports 2: Outlet 3: Main valve hole 4: Main valve seat 5: Diaphragm 6: Retainer 7: Virusoto valve hole 8: Diaphragm back chamber 9 nib lead hole
10: Solenoid 11 Nibrangier 12: Valve body 15: Protrusion Patent applicant Totokiki Co., Ltd.

Claims (1)

[Claims] 1. A main valve hole (3) is formed between an inlet (1) and an outlet (2) provided in the valve box (C), and is provided at one side periphery of the main valve hole (3). A diaphragm (5) that opens and closes the main valve hole (3) is in contact with the main valve seat (4) so as to be able to move toward and away from the main valve seat (4), and a pilot valve hole is provided in the center of the retainer (6) that supports the diaphragm (5). (7), and the pilot valve hole (7) communicates the diaphragm back chamber (8) with the outlet (2) side, and the bleed hole (9) connects the diaphragm back chamber (8) with the inlet (1) side. ), a plunger (11) driven by a solenoid (10) is arranged above the pilot valve hole (7), and a valve body (12) attached to the lower end of the plunger (11) , in a solenoid valve configured to open and close the pilot valve hole (7), the outer diameter (d) of the protrusion (15) provided at the center of the lower surface of the retainer (6) and the main valve hole (3) A solenoid valve characterized in that a relative relationship with an inner diameter (D) is (D-d)/D×100≦10.